Running RE01 sample.in I get an overflow in G4ChipsNeutronElasticXS.cc:2036 because the variable pa is too large, about 2.7e+163 and the code tries to compute pa*pa
I've just run this example and could not reproduce the problem. Please run it again with one of the recent patches of 10.0 (patch-01 or later) and let me know if you still have the problem.